4,5'-[Isopropylidenebis[(4,1-phenylene)oxy]]bis(isobenzofuran-1,3-dione);4-[4-[1-[4-[[(1,3-Dihydro-1,3-dioxoisobenzofuran)-5-yl]oxy]phenyl]-1-methylethyl]phenoxy]-1,3-isobenzofurandione
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